Hello implementators

Recently we ran into following dialog matching issue with new SS7 GW device:

our customers proxy modified from URI in initial INVITE, but did not do
the same anymore for in-dialog BYE. This caused our new GW to not match the
dialog and sessions we're only terminated once GW sent BYE.

After customer changed behaviour (to manipulate also in-dialog requests)
in their proxy, GW was able to match in-dialog request again correctly.


I filed a report with the GW vendor, but they refuse to accept
behaviour as a bug.

My arguments for this being a serious defect are:

1. tags we're untouched and correct all the time
2. RFC3261 12.2.1.1 Generating the Request:
---
It is expected that mandatory reflection of the original To and From URI
in mid-dialog requests will be deprecated in a subsequent revision of
this specification
---
3. robustness principle

I can already see another customer to bump into same issue, can anyone come with
better arguments than I did?

-- 
Mikko Lehto
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